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本来， ほんらい
1. originally, primarily
2. essentially, intrinsically, naturally, by nature, in (and of) itself
3. proper, rightful, legal, normal
本来
は
1. indicates sentence topic
2. indicates contrast with another option (stated or unstated)
3. adds emphasis
指示句子的主题；表示与另一选项（无论是否明确提及）形成对比；表示强调
